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Excerpt from The American Journal of Science and Arts, Vol. 66
(1.) The object of this paper is to prove the existence of different properties in the rays of the spectrum, in their action on vegetables, * and more especially to show that the rays which produce the green color of plants, are altogether dissimilar from those which influence their movements towards light-the color being developed by the less refrangible rays, and chiefly by the yellow; whereas, the motion is influenced by indigo light. The discussion of the subject will be divided under three heads:
1. On the production of chlorophyl by yellow light.
2. On the movements of plants towards indigo light.
3. Some application of these facts to vegetable physiology.
I. On the production of chlorophyl by yellow light
(2.) It is a fundamental fact in botany that light is necessary to the formation of chlorophyl. Yon Humboldt adduced certain exceptions to this law, in the case of plants found in the mines of Freyberg, and with Senebier ascribed the green matter to the action of hydrogen gas. But the experiments of the latter failed in the hands of De Candolle, and a series instituted by myself, and conducted with great care, were equally unsuccessful.
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|Title||The American Journal of Science and Arts, Vol. 66 (Classic Reprint)|